Make a list of factors for both the coefficient of the x^2 term and the constant. In this case, 1 and 10. so 1X1 and then 1X10 and 2X5. Also, the fact that the constant is a negative 10, that means one of the 2 binomials
must be negative. Then you look for the combination of the sets of factors that when put together with FOIL, you get the middle term, in this case, 3x.

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